Development and Performance Evaluation of Portable Light Therapy Apparatus for Improvement of Sleep and Wakefulness

Yuasa, Tomonori; Miura, Jun; Sugai, Yasunori; Ito, Yohko; Sasaki, Hayato; Aizu, Yoshihisa

doi:10.9746/sicetr.54.691

Cited by 1 publication

(4 citation statements)

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“…Concerning the safety measurement in the clinical trial, no abnormalities were found in the subjects' retinas or eyesight after the study. Taken together with the previous hazard analysis [ 12 ], our goggles with 30%-cut light may be safe in so far as they are used properly for up to 4 days. However, as bright light therapy may last longer than 4 days, long-term safety evaluation tests are desirable.…”

Section: Discussionmentioning

confidence: 59%

“…The phototherapy goggles ( Figure 1 ) were prepared by the authors [ 12 ]. LEDs (Cree, Durham, NC) were fitted to the back of the frame.…”

Section: Methodsmentioning

confidence: 99%

“…Light was irradiated onto the eye at an angle of 55° with an intensity of 10,000 lux at the cornea. The hazard analysis showed that the permitted exposure time of 30%-cut light was 79 min in accordance with safety standard JIS C7550 [ 12 ].…”

Section: Methodsmentioning

confidence: 99%

“…We have developed portable goggles for bright light therapy ( Figure 1 ) using LEDs as the light source [ 12 ]. To minimize the possible hazard to the retina, we have reduced the emission of short-wavelength light by 30% or 50% while keeping an intensity of 10,000 lux at the cornea.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Bright Light with Reduced Blue Light on Sleepiness on Rising: A Small Exploratory Study

Miura

Yuasa

Sugai³

et al. 2018

Sleep Disorders

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Bright light therapy is a treatment modality for seasonal affective disorder and circadian rhythm disorders in which artificial light of 2,500 lux or higher at the eye is effective. Although short-wavelength visible light is more effective than long-wavelength visible light, it may be hazardous to the retina. Recently, light-emitting diodes (LEDs) have been used as the light source in bright light therapy apparatuses. We developed goggles for bright light therapy equipped with LEDs as the light source. The aim of this study was to examine the efficacy and safety of our goggles when emitting 10,000-lux light with its short-wavelength light content reduced by 30% or 50% (denoted as 30%-cut and 50%-cut light, respectively, henceforth). Six healthy young males participated in this study. They were administered no light, 50%-cut light, and 30%-cut light for 30 min early in the morning for 4 days each. Subjective sleepiness and sleep quality were evaluated by the Stanford Sleepiness Scale (SSS) and the Oguri–Shirakawa–Azumi sleep inventory MA version (OSA-MA), respectively. Subjective sleepiness evaluated by the SSS and the subscale of the OSA-MA significantly decreased with 30%-cut light compared with no light. Psychomotor performance evaluated by a calculation task improved with the 30%-cut light, although not significant after multiple comparisons were considered. No abnormality was found by ophthalmoscopy and the vision test. In conclusion, our goggles with 30%-cut light may be safe and have an awakening effect.

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Section: Discussionmentioning

confidence: 59%

“…The phototherapy goggles ( Figure 1 ) were prepared by the authors [ 12 ]. LEDs (Cree, Durham, NC) were fitted to the back of the frame.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Bright Light with Reduced Blue Light on Sleepiness on Rising: A Small Exploratory Study

Miura

Yuasa

Sugai³

et al. 2018

Sleep Disorders

Self Cite

View full text Add to dashboard Cite

show abstract

Development and Performance Evaluation of Portable Light Therapy Apparatus for Improvement of Sleep and Wakefulness

Abstract: We have recently developed a portable light therapy apparatus for improvement of sleep quality and wakefulness. This technical note presents some preliminary experiments useful for design and evaluation of portable light therapy apparatus.

Cited by 1 publication

References 3 publications

Effects of Bright Light with Reduced Blue Light on Sleepiness on Rising: A Small Exploratory Study

Effects of Bright Light with Reduced Blue Light on Sleepiness on Rising: A Small Exploratory Study

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